RE may be an abbreviation or a word or name. It may refer to:

• RE (automobile), a 1960s Rhodesian Formula One racing car
• RE (complexity), the set of recursively enumerable languages
• RE (e-mail), or "Re:", followed by the subject of a previous message indicates a reply to the subject of that message. It is an abbreviation from the legal Latin 'In res' (see Fowlers Modern English Language p. 653)
• RE, the IATA code for Stobart Air, an Irish regional airline
• RE, meaning rare earth, one of a set of seventeen chemical elements in the periodic table
• RE, meaning real estate, property consisting of land and the buildings on it
• RE, meaning Reproductive endocrinologist, a doctor specializing in the field of fertility
• RE, meaning rotary engine, an early type of internal-combustion engine
• Royal Society of Painter-Printmakers (RE), known until 1991 as the Royal Society of Painter-Etchers and Engravers
• Realencyclopädie der Classischen Altertumswissenschaft, commonly called the Pauly–Wissowa or simply RE, a German encyclopedia of classical scholarship
• Recursively enumerable set (r.e.), a special set S of natural numbers
• Relative effectiveness factor, or R.E. factor, relates an explosive's demolition power to that of TNT
• Resident Evil, a franchise of horror-adventure video games
• Réunion, a French island (pop. ~800,000) near Mauritius, ISO 3166 digram and FIPS PUB 10-4 territory code
  • .re, Internet country code top-level domain (ccTLD) of Réunion
• Reuptake enhancer, a type of drug which enhances reuptake of a neurotransmitter
• Reverse engineering, the process of taking something (a device, an electrical component, a software program, etc.) apart and analyzing its workings in detail
• Requirements engineering during the development of computer programs
• Rock-Eval, an apparatus for assessing the oil potential of a sedimentary rock, designed at the French Institute of Petroleum
• Royal Engineers, a corps of the British Army
• Religious education
• Abbreviations of single words:
  • Re(z) or : the real part in mathematics
  • Reynolds number, in physics
  • Réaumur scale degree of temperature (°Ré)
  • Rhenium, a chemical element whose symbol is "Re"
  • Re., or Rupee, a currency in many Asian countries

.re is the Internet country code top-level domain (ccTLD) for Réunion (a French island located in the Indian Ocean, east of Madagascar). Along with .fr, .tf, and .ovh, it is administered by AFNIC.

...Re (Yakshaprashne) (, ) is an upcoming Indian Kannada language comedy film written and directed by Sunil Kumar Desai. The film has an ensemble cast consisting of veteran actors: Ramesh Aravind, Anant Nag, Master Hirannaiah, Loknath, Shivaram, Tennis Krishna, Ramesh Bhat, Vaijanath Biradar, Sharath Lohitashwa, Suman Nagarkar, G. K. Govinda Rao among others. Harshika Poonacha and debutant actress Suman play female leads in the film. Ace cinematographer G S Bhaskar who has previously worked for Hollywood legends such has Richard Attenborough has handled the camera. Veteran music director Hamsalekha has composed the music for the film.

This is a list of Latin words with derivatives in English (and other modern languages).

RA may refer to:

• Right ascension, an astronomical term
• Relation algebra, a type of mathematical structure

Ra (; , ) or Re (; , Re) is the ancient Egyptian sun god. By the Fifth Dynasty in the 25th and 24th centuries , he had become a major god in ancient Egyptian religion, identified primarily with the noon sun.

Re! is the name of a Greek album by singer Anna Vissi released in Greece and Cyprus on December 24, 1994. It was recorded in London at Whitfield Street Recording Studios and released by Sony Music Greece. It is the most acoustic album Vissi has released up to date. It was repackaged in 1995 to include the songs "Amin", "Eleni" and a remix of "Eimai Poli Kala". Music and lyrics are by Nikos Karvelas and Evi Droutsa.

Re. is the third studio album by Japanese pop singer Aya Ueto. It was released on December 8, 2004 on Flight Master.

Île de Ré (; variously spelled Rhé, Rhéa or Rhea; in English Isle of Rhé) is an island off the west coast of France near La Rochelle, on the northern side of the Pertuis d'Antioche strait. The island's highest point has an elevation of ; the island is long and wide. The  Île de Ré bridge, completed in 1988, connects it to La Rochelle on the mainland.